


student_scores = {'Alice':90, 'Bob': 85, 'Charlie': 92, 'David': 78, 'Eva': 88}
student_scores['Frank'] = 95
student_scores['Bob'] = 90
student_scores.pop('David')
name = input('请输入想要查询的学生')
if name in student_scores:
    print(student_scores[name])
else :
    print('没有你想要查询的学生')
print(max(student_scores))
print(student_scores.items())